package reusing;
class Engine {
	public void start(){}
	public void rev(){}
	public void stop(){}
	
}
class Wheel {
	public void inflate (int psi){}
}
class Window {
	public void rollup(){}
	public void rolldown(){}
}
class Door {
	public Window window  = new Window();
	public void open () {}
	public void close() {}
}
public class Car {
    public Engine engine =  new Engine();
    public Wheel[] wheel  = new Wheel[4];
    public Door
         left  = new Door(),
         right = new Door();
    public Car() {
    	for (int i = 0; i < 4; i++) {
			wheel[i] = new Wheel();
		}
    }
    public static void main(String[] args) {
		Car car = new Car();
		car.left.window.rollup();
		car.wheel[0].inflate(72);
	}
}
